Compasses or dividers.



C. BRAND. GOMPSSBS OR DIVIDERS. APPLIOATION FILED MAY 21, 190B.

Patented May 4, 1909.

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GHARLESEDWARD HAND, OF DUNDAS, ONTARIO, CANADAA COMPASSES OR DIVIDERS.

Specification of Letters Patent.

Patented May 4, 1909.

Application iled May 21, 1908. Serial No. 434,016.

To all whom it 'may concern:

Be it known that l, CnAnLns EDWARD HAND, a subject of the King of Great Britain, and resident oi Dundas, in the county of i'ventworth and Province of Ontario, Canada, have invented new and useful improvements in Compasses or ividers, of which the following` is a specification.

illy invention relates to improvements in compasses, or dividers, in which pivotally connected legs are provided with pivotally connected marking elements and link inembers ecccntrically operating in the legs and connected to said marking elements that at the adjustment ol the compass, the marking elements shall be parallel with each other, together with the centrally located upper handle.

The objects ol my invention are iirst, to provide a compass having substantially parallel marking elements second, to provide a compass having a handle, which shall be substantially parallel with the marking elements at the adjustment oi the compass; third, to provide means whereby one said compass point, or marking element, may be minutely, and independently acjusted, tour th, to provide means whereby the lower connections of the link members shall receive propel' spring tension to retain the same in operative position with the movable compass marking element ine/chan nl. l attain these objects by the mechanism illustrated in the accompanying drawing in which z* Figure 1 is an elevation of the compass partially widened out. Fig. 2 is an elevation of the same, partially contracted, the upper tightening thumb screw, together with the compass marking elements, or points, being removed. Fig. is a detail elevation of the detached centrally located handle. Fig. 4 is a section ol a leg through the horizontal broken line 12, 2, in Figs. l and 2 oi the drawing. Fig. 5 is an elevation el' the detached left-hand link member of the compass. is an elevation of the detached right-hand link member oi the compass. Fig. 7 is an elevation ol' the detached left-hand leg of the compass, as viewed from the inner side thereof. S is an elevation of the detached right-hand leg of the compass as viewed from the inner side thereof. Fig. 9 is an enlarged sectional elevation oi the upper part of the compass through the central broken vertical line 3, 3, of Fig. 1, of the drawing, and as viewed from the right-hand side thereof, the

lower parts of the compass being broken away.

Similar characters refer to similar parts throughout the several views.

In the drawing the two legs ol' the compass are indicated by A, and are substantially similar to each other, and are pivotally connected to the transverse pivot, or bolt B, which has a thumb nut l, at one end, and a head 5, at the opposite end. On one leo' is a raised part (i, in contact with one flat side of the head, to prevent the pivot or bolt from turning, and shown in llig. 9, 0ll the drawing. rfhe lower part ol each leg extends from a distance between the lower end ol' the flanges 7, and is integral therewith as shown in Figs. 7 and 8 ol` the drawing. The side flanges 7 0l the legs A, extend about three fourths of the length thereof and act as guides for the link members D. The sockets C, have spring splits as at 8, and are integral with the flanges, or plates 10. The lower parts of the leg members A, are pivotally connected at 9, to the ilanges or plates 10. The split sockets C, are adapted to receive points, or marking elements, 12 and 13, which extend through the split-spring sockets and lasten therein by means ol the spring splits 8, ol' the sockets C. One said marking element or point 12, is eccentric, and has a manipulating teat 14, to rotate the point 12, and minutely set the same to desired place, alter the compass is tightened, or set, by means ol the thumb screw Ll. The opposite point or marking element 13, may be oi steel, and removable, lor the introduction oll pencil, or pen, or other marking element. The upper pivotal ends oi' the legs A are widened out to receive the several mechanical parts which l'orm the compass, and on one inner side ol' each widened part oll a leg A, is a round hub or projection 15, eccentric with the central pivot B, said hubs may be properly termed eccentrics 15.

D, are link members which have upper holes 16, to conform with the round inwardly projecting eccentrics 15 or"l the legs, and said links are adapted to slide easily between the ilanges, or sides 7, that is in the U ol' the legs. The holes 16 have opposite recesses, or s ight indentations 17, in order that the wearing part of said holes shall be more marked on the inner sides than on the outer sides ol' the holes. The links have slots 18, and the arm parts 19 oi' the links are shortened, to escape the lower extended parts of the legs D.

2O are transverse pins through the leg members A, and it in the slots 18 inthe link members D. The pins 20, are retaining pins, to retain the arms 19 of the links in position in the U part of the legs A, consequently to afford spring tension to the lower end parts oi the links which pivot, or connect to the pins E, of the flanges 10. The lower end parts ol' the link members have suitably formed recesses F, to fit the pins E, and the pins 2O engage with the arms 19 of the links and retain the recesses F in spring tension contact with the pins E. The inner ends ol' the recesses F are slightly indented or extended, as at 22, that the pins E may tend to wear on the ends ol' the recesses, instead oi the lower and upper parts thereof.

The vertical handle H has a lower flat shank part l, having a vertical slot (l, and two horizontal slots K. The bolt or pivot B, passes easily through the slot J, and the slots K receive the studs S, of the legs A, to retain the handle H, that is, when the com'- p'ass is extended, the studs S in the slots K gradually lii't the handle, and when the comass is contracted, said studs gradually ower the handle H, and retain the same, thereby preventing any lateral movement of the handle.

When the compass is being extended, the studs S, acting from opposite sides ol` the legs A, and in the slots K, slightly raise the handle H. At the same time the eccentri'cs 15 engage the holes 16, in the links D, thereby raising [said links and consequently raising the pins E, together with the vdouble flanges 10, on their pivots 9, vand thereby bring the sockets C on said flanges to vertical position. lVh-en closing or contracting the compass, the handle H is brought downwardly to# gether with the link members D, and the sockets C, together with their points 12 and 13 are substantially parallel, and always remain so. A

Vhat I claim as my invention and desire to secure by Letters Patent, is

1. ln a compass, a central transverse pivot, or bolt, legs ol' U cross section pivotally connected thereto, eccentri'cs on the inner sides ol' the legs, marking elements pivotally connected to the opposite ends oi' the legs, link members on the eccentrics and the opposite end of the links loosely connected to the marking elements and means in the legs and the links to retain said link and rking element connection, intact.

2. ln a compass, a central pivot, legs ol U cross section pivotally connected thereto, eccentrics on the inner sides oll the legs, sockets pivotally connected to the opposite ends oi the legs, link members connecting the eccentrics with the sockets, link pressure means in the legs, an eccentric point or marking element in the socket, or sockets, ol' one said leg, and means on the marking element to adjust the same, and a marking element in the socket, or sockets, ol the opposite leg.

3. ln a con'ipass, a central pivot, legs pivotally connected thereto, eccentrics on the legs, marking element-s pivotally connected to the opposite ends ol' the legs, link members loosely connecting the eccentrics and marking elements, studs inwardly extending from one side of the legs, link pressure means in the legs, a centrally located handle having a vertical slot and horizontal slots, said vertical slot to permit motion on said central pivot and the horizontal slots adapted to receive said studs to retain the handle hall way between the positions oli' the two legs.

4. In a compass, a central pivot or bolt, a thumb-nut, at one end and a head at the opposite end thereof, legs pivotally connected thereto, means on one said leg to retain the head, guide flanges on the legs, eccentrics on the inner sides of the legs, marking members pivotally connected to the opposite ends ol' the legs, link members connecting the eccentrics and the marking members and adapted to slide between said guide ilanges, means in the legs and in the link members to afford spring tension to the connections olV` the link members and the marking element members.

CHARLES EDWi-lltD HAN D.

lVitnesses SPENCER Bmoos, JOHN H. HENDRY. 

